oblivious

[uh-bliv-ee-uhs]
adjective
1.
unmindful; unconscious; unaware (usually followed by of or to ): She was oblivious of his admiration.
2.
forgetful; without remembrance or memory: oblivious of my former failure.
3.
Archaic. inducing forgetfulness.

Origin:
1400–50; late Middle English < Latin oblīviōsus forgetful, equivalent to oblīvī(scī) to for-get + -ōsus -ous

obliviously, adverb
obliviousness, noun
self-oblivious, adjective
semioblivious, adjective
semiobliviously, adverb
semiobliviousness, noun
unoblivious, adjective
unobliviously, adverb
unobliviousness, noun

oblivious, obvious.


2. See absent-minded.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
oblivious (əˈblɪvɪəs)
 
adj (foll by to or of)
unaware or forgetful
 
usage  It was formerly considered incorrect to use oblivious to mean unaware, but this use is now acceptable
 
ob'liviously
 
adv
 
ob'liviousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

oblivious
mid-15c., from L. obliviosus "forgetful, producing forgetfulness," from oblivionem (see oblivion). Meaning "unaware, unconscious (of something)" is from 1862, formerly regarded as erroneous, this is now the general meaning and the word has lost its original sense of "no
longer aware or mindful." Properly should be used with to, not of.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They sat there cricket and spider, each oblivious to the other.
To dismiss how these cycles continuously repeat themselves is to be oblivious
  to cyclic patterns.
What is surprising to me is how oblivious people are to the speed and magnitude
  of this progress.
My concern and you for some reason seem oblivious to it is that cultures come
  and go.
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